Wire feeding stabilizing circuit of handheld laser welding wire filling machine

Abstract

A wire feeding stabilizing circuit of a handheld laser welding wire filling machine is characterized in that a half-bridge MOS (metal oxide semiconductor) tube driving chip U6 is connected with a group of PMW1 signals, a G pole of an MOS tube Q1 and a G pole of an MOS tube Q2, a D pole of the MOS tube Q1 is connected with + 24V, an S pole of the MOS tube Q1 and a D pole of the MOS tube Q2 are connected and connected to MV +, and the S pole of the MOS tube Q1 is grounded; the half-bridge MOS tube driving chip U7 is connected with a group of PMW2 signals and is connected with a G pole of an MOS tube Q3 and a G pole of an MOS tube Q4, a D pole of the MOS tube Q3 is connected with + 24V, an S pole of the MOS tube Q3 and a D pole of the MOS tube Q4 are connected and are connected to MV-, and an S pole of the MOS tube Q4 is grounded; one end of the resistor R22 is connected with the MV + and the MV-, the other end of the resistor R22 is connected with one end of the resistor R23 and is connected to the ADCMV acquisition end of the single chip microcomputer, and the other end of the resistor R23 is grounded. The circuit collects the operation counter electromotive force voltage of the motor so as to provide the counter electromotive force voltage to a control chip for constant control of the counter electromotive force voltage, thereby being beneficial to keeping the constant wire filling speed of the wire filling machine.

Description

Technical Field

[0001] The present application relates to welding machine control technology, and in particular to a wire feeding stabilization circuit of a handheld laser welding wire-filling machine. Background Art

[0002] Traditional handheld laser welding wire-filling machines achieve a constant wire-filling speed by controlling the motor voltage. When the wire-filling hose is bent or subjected to other external forces, the motor voltage remains unchanged and the motor torque hardly changes, resulting in uneven force on the welding wire. Ultimately, the wire-filling speed of the entire handheld laser wire-filling machine is unstable, thus affecting laser welding. Utility Model Content

[0003] In order to solve the deficiencies of the above-mentioned prior art, the present application provides a handheld laser welding wire feeding stabilization circuit, which collects the back electromotive force voltage of the motor operation so as to provide it to the control chip to control the back electromotive force voltage to maintain a constant, thereby facilitating maintaining a constant wire feeding speed of the wire filling machine.

[0004] In order to achieve the above purpose, the utility model adopts the following technologies:

[0005] A wire feeding stabilization circuit for a handheld laser welding wire-filling machine, comprising a forward and reverse control module and a voltage sampling module;

[0006] The forward and reverse control module includes a half-bridge MOS tube driver chip U6, a half-bridge MOS tube driver chip U7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, and a MOS tube Q4;

[0007] The half-bridge MOS tube driver chip U6 is connected to a group of PMW1 signals, and is connected to the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2. The D pole of the MOS tube Q1 is connected to +24V, the S pole of the MOS tube Q1 and the D pole of the MOS tube Q2 are connected and connected to MV+, and the S pole of the MOS tube Q2 is connected to the ground.

[0008] The half-bridge MOS tube driver chip U7 is connected to a group of PMW2 signals, and is connected to the G pole of the MOS tube Q3 and the G pole of the MOS tube Q4. The D pole of the MOS tube Q3 is connected to +24V, the S pole of the MOS tube Q3 and the D pole of the MOS tube Q4 are connected and connected to MV-, and the S pole of the MOS tube Q4 is connected to the ground.

[0009] The voltage sampling module includes a resistor R22 and a resistor R23. One end of the resistor R22 is connected to MV+ and MV-, and the other end is connected to one end of the resistor R23 and to the ADC_MV acquisition end of the single-chip computer. The other end of the resistor R23 is connected to the ground.

[0010] Furthermore, the voltage sampling module also includes a diode D6 and a diode D7, one end of the resistor R22 is connected to the cathode of the diode D6 and the cathode of the diode D7, the anode of the diode D6 is connected to MV+, and the anode of the diode D7 is connected to MV-.

[0011] Furthermore, the voltage sampling module further includes a voltage stabilizing diode D8, an anode of which is connected to the ground, and a cathode of which is connected to the other end of the resistor R22.

[0012] Furthermore, the voltage sampling module further includes a capacitor C7, one end of the capacitor C7 is connected to the other end of the resistor R22, and the other end of the capacitor C7 is connected to the ground.

[0013] The utility model has the beneficial effects of simple circuit structure and easy implementation. By collecting the back electromotive force voltage of the motor, it is provided to the control chip to control the back electromotive force voltage to keep constant, thereby facilitating the constant filling speed of the wire filling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a circuit schematic diagram of an embodiment of the present application.

[0015] Figure 2 Schematic diagram of waveforms for generating back electromotive force according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings, but the embodiments described in the utility model are only part of the embodiments of the utility model, rather than all the embodiments.

[0017] An embodiment of the present application provides a wire feeding stabilization circuit for a handheld laser welding wire-filling machine, including a forward and reverse control module and a voltage sampling module.

[0018] like Figure 1 As shown, the forward and reverse control module includes a half-bridge MOS tube driving chip U6, a half-bridge MOS tube driving chip U7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, etc.

[0019] Among them, the half-bridge MOS tube driver chip U6 is connected to a group of PMW1 signals: PMW1_H and PMW1_L. Specifically, PMW1_H is connected to the 2nd pin of the half-bridge MOS tube driver chip U6 through a resistor R18, and PMW1_L is connected to the 3rd pin of the half-bridge MOS tube driver chip U6 through a resistor R19. The 1st pin of the half-bridge MOS tube driver chip U6 is connected to the positive electrode of the diode D4, and the negative electrode of the diode D4 is connected to the 8th pin of the half-bridge MOS tube driver chip U6 and the positive end of the capacitor C5. The negative end of the capacitor C5 is connected to the 6th pin of the half-bridge MOS tube driver chip U6. Pin 4 of the S tube driver chip U6 is connected to the ground, pin 7 of the half-bridge MOS tube driver chip U6 is connected to the G pole of the MOS tube Q1 through the resistor R10, pin 6 of the half-bridge MOS tube driver chip U6 is connected to the G pole of the MOS tube Q1 through the resistor R11, pin 5 of the half-bridge MOS tube driver chip U6 is connected to the G pole of the MOS tube Q2 and one end of the resistor R13 through the resistor R12, the other end of the resistor R13 is connected to the ground, the D pole of the MOS tube Q1 is connected to +24V, the S pole of the MOS tube Q1 and the D pole of the MOS tube Q2 are connected and connected to MV+, and the S pole of the MOS tube Q1 is connected to the ground.

[0020] The half-bridge MOS tube driver chip U7 is connected to a group of PMW2 signals, PMW2_H and PMW2_L. Specifically, PMW2_H is connected to the 2nd pin of the half-bridge MOS tube driver chip U7 through a resistor R20, and PMW2_L is connected to the 3rd pin of the half-bridge MOS tube driver chip U7 through a resistor R21. The 1st pin of the half-bridge MOS tube driver chip U7 is connected to the positive electrode of the diode D5, and the negative electrode of the diode D5 is connected to the 8th pin of the half-bridge MOS tube driver chip U7 and the positive end of the capacitor C6. The negative end of the capacitor C6 is connected to the 6th pin of the half-bridge MOS tube driver chip U7. Pin 4 of the driver chip U7 is connected to the ground, pin 7 of the half-bridge MOS tube driver chip U7 is connected to the G pole of the MOS tube Q3 through a resistor R14, pin 6 of the half-bridge MOS tube driver chip U7 is connected to the G pole of the MOS tube Q3 through a resistor R15, pin 5 of the half-bridge MOS tube driver chip U7 is connected to the G pole of the MOS tube Q4 and one end of the resistor R17 through a resistor R16, the other end of the resistor R17 is connected to the ground, the D pole of the MOS tube Q3 is connected to +24V, the S pole of the MOS tube Q3 and the D pole of the MOS tube Q4 are connected and connected to MV-, and the S pole of the MOS tube Q4 is connected to the ground.

[0021] Optionally, the half-bridge MOS tube driver chip U6 and the half-bridge MOS tube driver chip U7 use IR2103STRPBF.

[0022] like Figure 1As shown, the voltage sampling module includes a resistor R22, a resistor R23, a diode D6, a diode D7, a voltage zener diode D8, and a capacitor C7. One end of the resistor R22 is connected to MV+ and MV-, and the other end is connected to one end of the resistor R23 and to the ADC_MV acquisition end of the single-chip computer, and the other end of the resistor R23 is connected to the ground. One end of the resistor R22 is connected to the cathode of the diode D6 and the cathode of the diode D7, the anode of the diode D6 is connected to MV+, and the anode of the diode D7 is connected to MV-. The anode of the voltage zener diode D8 is connected to the ground, and the cathode is connected to the other end of the resistor R22. One end of the capacitor C7 is connected to the other end of the resistor R22, and the other end of the capacitor C7 is connected to the ground.

[0023] When the motor rotates forward, PWM1_H is the PWM signal, PWM1_L is normally high, PWM2_H is normally low, and PWM2_L is normally low. At this time, MOS tube Q1 is controlled in the switching state, MOS tube Q2 and MOS tube Q3 are turned off, and MOS tube Q4 is normally open; when the motor rotates reversely, PWM1_H is normally low, PWM1_L is normally low, PWM2_H is the PWM signal, and PWM2_L is normally high. At this time, MOS tube Q3 is controlled in the switching state, MOS tube Q1 and MOS tube Q4 are turned off, and MOS tube Q2 is normally open.

[0024] PWM is based on a sine wave. When PWM is turned off, the motor continues to flow and the motor rotates in the electromagnetic field to generate back electromotive force, such as Figure 2 As shown in the figure, the PWM control cycle is 50us (20KHZ), and the MOS tube is controlled by a chopping signal based on a 10ms period (100HZ) sine wave. When the PWM control signal stops within 10ms, the motor rotates in the electromagnetic field due to inertia and generates back electromotive force.

[0025] The motor voltages of MV+ and MV- are obtained through the voltage sampling module, divided by the resistors R22 and R23 of the voltage divider unit, stabilized by the voltage stabilizing diode D8, and input into the RC filtering unit composed of the capacitor C7 and the voltage dividing resistors, and then input into the ADC_MV acquisition terminal of the microcontroller.

[0026] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application.

Claims

1. A wire feeding stabilization circuit for a handheld laser welding wire-filling machine, characterized in that: Including forward and reverse control module and voltage sampling module; The forward and reverse control module includes a half-bridge MOS tube driver chip U6, a half-bridge MOS tube driver chip U7, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, and a MOS tube Q4; The half-bridge MOS tube driver chip U6 is connected to a group of PMW1 signals, and is connected to the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2. The D pole of the MOS tube Q1 is connected to +24V, the S pole of the MOS tube Q1 and the D pole of the MOS tube Q2 are connected and connected to MV+, and the S pole of the MOS tube Q2 is connected to the ground. The half-bridge MOS tube driver chip U7 is connected to a group of PMW2 signals, and is connected to the G pole of the MOS tube Q3 and the G pole of the MOS tube Q4. The D pole of the MOS tube Q3 is connected to +24V, the S pole of the MOS tube Q3 and the D pole of the MOS tube Q4 are connected and connected to MV-, and the S pole of the MOS tube Q4 is connected to the ground. The voltage sampling module includes a resistor R22 and a resistor R23. One end of the resistor R22 is connected to MV+ and MV-, and the other end is connected to one end of the resistor R23 and to the ADC_MV acquisition end of the microcontroller. The other end of the resistor R23 is connected to the ground.

2. The wire feeding stabilization circuit of the handheld laser welding wire filling machine according to claim 1 is characterized in that: The voltage sampling module also includes a diode D6 and a diode D7. One end of the resistor R22 is connected to the cathode of the diode D6 and the cathode of the diode D7. The anode of the diode D6 is connected to MV+, and the anode of the diode D7 is connected to MV-.

3. The wire feeding stabilization circuit of the handheld laser welding wire filling machine according to claim 1 is characterized in that: The voltage sampling module further includes a voltage stabilizing diode D8 , an anode of which is connected to the ground, and a cathode of which is connected to the other end of the resistor R22 .

4. The wire feeding stabilization circuit of the handheld laser welding wire filling machine according to claim 1 is characterized in that: The voltage sampling module further includes a capacitor C7, one end of the capacitor C7 is connected to the other end of the resistor R22, and the other end of the capacitor C7 is connected to the ground.

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